Issue 37

I.Llavori et alii, Frattura ed Integrità Strutturale, 37 (2016) 87-93; DOI: 10.3221/IGF-ESIS.37.12

Figure 8 : Left side: Detailed view of the Miner’s damage evolution to crack initiation. Right side: Estimated SIF range vs. cycles in propagation.

Test

Experimental life

Numerical life prediction

9A (δ = 36 µm) 10A (δ = 104 µm)

47,833

49300

No crack prediction

>1,000,000 a

a Test were stopped after 1 million cycles.

Table 1: Comparison between experimental life and numerical prediction.

C ONCLUSIONS

I

n this work, an all-in-one 2D cylinder on flat numerical model that combines wear, crack initiation and propagation has been presented. The numerical results obtained in this work are in a very good agreement with the experimental data reported by Magaziner et al . [11]. On the one hand, it has been shown that due to wear simulation the stress field on the fretted bodies changes, depending on the amplitude of displacement. Therefore, it is concluded that the simulation of wear is a key element to assess correctly the life-span of the specimen under gross slip regime. On the other hand, due to the advantages of the X-FEM, it is possible to study explicitly the interaction between the fretting contact and the existing crack in the presence of wear. In future work, this method will allow to study in great detail the evolution of the fretting contact at different stages under gross slip regime.

A CKNOWLEDGEMENTS

T

he authors wish to thank Departamento de Educación, Política Lingüistica y Cultura del Gobierno Vasco for their financial support to the project NUSIMCO (Ref. PI2013-23) through the program “Proyectos de Investigación Básica y/o Aplicada”.

R EFERENCES

[1] Vingsbo, O., Soderberg, D., On fretting maps, Wear, 126 (1988) 131-147.

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